#include "../apue.h"
#include <errno.h>
#include <sys/time.h>

#if defined(MACOS)
#include <sys/syslimits.h>
#elif defined(SOLARIS)
#include <limits.h>
#elif defined(BSD)
#include <sys/param.h>
#endif


unsigned long long count;
struct timeval end;

void checktime(char * str)
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    if (tv.tv_sec >= end.tv_sec && tv.tv_usec >= tv.tv_usec)
    {
        printf("%s count = %llu\n", str, count);
        exit(0);
    }

}

int main(int argc, char ** argv)
{
    pid_t pid;
    char *s;
    int nzero, ret;
    int adj = 0;

    setbuf(stdout, NULL);

#if defined(NZERO)
    nzero = NZERO;
#elif defined(_SC_NZERO)
    nzero = sysconf(_SC_NZERO);
#else
#error NZERO undefined
#endif

    printf("NZERO = %d\n", nzero);
    if (argc == 2)
        adj = strtol(argv[1], NULL, 10);
    gettimeofday(&end, NULL);
    end.tv_sec += 10;

    if((pid = fork()) < 0)
        err_sys("fork error");
    else if (pid == 0)
    {
        s = "child";
        printf("current nice value in child is %d, adjusting by %d\n", nice(0)+nzero, adj);
        errno = 0;
        if ((ret = nice(adj)) == -1 && errno != 0)
            err_sys("child set scheduling priority");
        printf("now child nice is %d\n", nice(0) + nzero);

    } else {
        s = "parent";
        printf("current nice value in parent is %d\n", nice(0)+nzero);
    }

    for (;;)
    {
        if (++count == 0)
            err_quit("%s counter wrap", s);

        checktime(s);
    }

    return 0;
}
